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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.228

Model-backed pre-flight check on shell commands is gone

You'll notice
Useful4 Signal3
Permissions

Shell commands start faster because the safe prefix is now worked out locally.

What

Claude Code no longer sends a candidate shell command to a model to work out its safe prefix before running it. That means one fewer round-trip and one fewer thing that can stall or fail before a command starts. The prefix is now derived locally from the already-parsed command.

Details
  • The removed results command_injection_detected and dangerous_shell_prefix no longer exist.
  • The 10-second message "Pre-flight check is taking longer than expected" can no longer appear.
Evidence

dangerous_shell_prefix

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.228 →